Strength of a permanent magnet

Permanent magnets are advertised as having some scalar strength, say, 1.5 Teslas, depending on the composition of the magnet but not its volume. I'm confused about what this means. Shouldn't the magnitude of the magnetic field vary depending on where you measure it? And if I epoxy together two equally-oriented magnets, I would expect that the magnitude of the magnetic field, at a sufficient distance from the magnets, would be approximately twice the strength of that of one of the magnets alone.

Coupling two magnets together increases the strength at large distances where the magnet looks like a dipole, but not at short distances. Near a face, or at a distance
d<L, there would be little change in the magnetic field. It could be slightly larger or slightly smaller depending on the location.